Tank-indicator.



F. W. JOHNSTONE.

TANK lNDlCATOR.

APPLICATION FILED JAN. 18. I915.

Patented Sept. 14, 1915.

WITNES s 7 Q Z1 were o ftvvv'v i JR; l t e n 1 TANK-INDICATOR.

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Specification of Letters Eatcnt.

Application filed January 18, 1915. Serial 1%. @3316.

The object of my invention is to provide means, of simple and inexpensive construction and ready application, whereby the rise,

fall, and stationary height of the level of" the liquid in tanks or reservoirs, particularly those of comparatively large dimensions used for the'storage of water and oil,

may be accurately indicated to an observer. The improvement claimed is hereinafter fully set forth.

" In the accompanying drawings: Figure 1 is a vertical central section through liquidstorage tank,.illustrating an application of my invention; Fig. 2, a partial plan view, on an enlarged scale; and, Fig. 3, a partial vertical central section, on a similar scale.

In the practice of my invention, which is herein exemplified in connection with :1 cy lindrical liquid storage tank, 1, two supporting brackets, 52, 2, are secured by bolts or rivets to the tank, adjacent to its top, and substantially diametrically opposite each other. A pair of bearing plates, 3, is secured to the bracket, 2, and a pair of hearing plates, 3*, of greater length, is secured to the bracket, 2. The two pairs of bearing plates are set in line horizontally, and the members of each pair are disposed on opposite sides of the brackets, to which they are connected by bolts or rivets, 4, 4?, respectively.

Two sheaves, 5 and 6, are journaled horizontally in the bearing plates, 3, adjacent to their outer ends, and two sheaves, 5 and 6, are journaled in the bearing plates, 3*, adjacent to their outer and to their inner ends, respectively. The journals of all the sheaves are located in the same horizontal plane; the sheaves, 5 and 5?, are located in the same vertical plane; and the sheaves, 6 and 6*, are located in a vertical plane parallel with that of the sheaves, 5 and 5.

A float, '7, 0t suliicient buoyancyv to be borne upon thesurface of the liquid in the storage tank, 1, is located therein, below the sheaves, 6?, and is connected, by a cord or chain, 8, passing over the sheaves, a and; 6,

to a counterweight, 9 which. is suspended by said cord or chain, on the outside of the-tank and below the sheave, 6. 1' 0 1 1 7. a aeig U, is. a so connected, y a or or lPat-ented li t, leis,

The counter 1 till chain, 10, passing over the sheaves, 5? and 5,

to an indicator, 11, which its-suspended by said cord or chain, on the outside of the tank, below the sheave, 5, and atthe same level as the float, 7. The counterweight see indicator are, consequently, locatedon. of?

posite sides of the axis of the tank, a i.,d -are adapted to move coincidently in relatively opposite directions, and the float indicater are adapted to move coincidently in the same direction. If Y It will. be seen that by the'above constrnm ion, the indicator will stand at the level as the liquid in the storage tank, and

will rise and fall coincidently with the cork responding changes of level of the liquid, as;

delivered to or withdrawn from the tanli,

thereby at all times giving a correct indication oi said level.

The number of operating parts is mini mined, and the appliance is adaptable tor] use in connection with storage tanks or reservoirs of any desired dimensions, at a.

comparatively small cost of installation,

I claim as my invention and desire to secure by Letters Patent:

1. The combination, with a liquid storage tank or reservoir, of a float therein, a counterweight and a cord directly connecting said float and counterweight, guide pulleys for said cord mounted on the wall of the tank, a level indicator outside the tank, a

second cord directly connecting said. indicator and counterweight, and guide pulleys for said second cord also mounted on the tank or reservoir, of a float therein, a courn terweight external of the tank, a pair. of pulleys mounted on the wall of the tank at diametrically opposite points, a cord passpair of pulleys and connected to said indiing over said pulleys and connected to said cator and counterweight.

float and counterweight a level indicator external of the tank on tl'ie opposite side from FRANCIS JOHNSTONE' 5 the counterweight, a second pair of pulleys 'lVitnesses:

mounted adjacent to said first pair, and an H. H. BURNHAM,

independent cord passing over said second MAY COLLIER. 

